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[MW:20714] Re: 20591] RE: 20584] Quarry regarding SFA 5.5

By Materials & Welding
Thank you sir. Plz. keep continuing sharing your experience.

Regards.

Anil
 http://in.linkedin.com/pub/anil-barik/13/aba/1a8/

On Wednesday, April 16, 2014 8:30:40 AM UTC+5:30, pgoswami wrote:
Hi Himan,
 
Ni+Mn in excess of 1.5% (older requirements) affects the AC1 temperature as illustrated below. For all good mechanical properties of P-91 welds this restriction should be maintained.  In 2013 version of Sec-1 code max limit of  Ni+Mn is restricted to 1.2%(see below). However  in Sec-II, Pt-C , SFA 5.5, Table-2, this limit is still 1.5% Max.
 
Procurement of  welding consumables should be based on  1.2% max limits , provided 2013 Sec-I code is being followed.
 
Based on this restriction one may choose the best PWHT temperature for Grade-91 welds, which should be below the AC1 temperature. PWHT in excess of AC1 temperature will reformation of Austenite during  exposure to intercritical temperature range (above AC1 temperature) which will turn into martensite upon cooling. This defeats the purpose of tempering
 
Hope this clears your doubts.
 
Thanks.
Pradip Goswami, P.Eng,IWE
Welding & Metallurgical Specialist
Ontario, Canada
 

(3) For welds made with nickel-based filler metals, or with Grade 91 filler metal (e.g., AWS B9, EN CrMo91, etc.) that has Ni + Mn content less than or equal to 1.0%, the maximum holding temperature can be increased to 1,470°F (800°C). However, if the PWHT encompasses multiple welds and any one of those welds was made with Grade 91 filler metal that has a Ni + Mn content greater than 1.0%, but not greater than 1.2%, or if the Ni + Mn content of the filler metal is unknown, the maximum PWHT temperature shall be 1,445°F (785°C).

Explanatory Note to (3) Above: The lower transformation temperature for matching filler material is affected by alloy content, primarily the total of Ni + Mn. The maximum holding temperature has been set to avoid heat treatment in the intercritical zone.

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of Himan Nikdin
Sent: Sunday, April 13, 2014 11:22 PM
To: material...@googlegroups.com
Subject: [MW:20584] Quarry regarding SFA 5.5

 

Dear Experts

 

As per note "J" of Table 2 of SFA A5.5 (SPECIFICATION FOR LOW- ALLOY STEEL ELECTRODES FOR SHIELDED METAL ARC WELDING) which contain chemical composition requirements for weld metal Ni+Mn content shall be max. 1.5% for E9015-B9, E9016-B9, E9018-B9, the question is why?

 

Regards,

Himan Nikdin 

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